{-# language CPP #-}
{-# language GeneralizedNewtypeDeriving #-}
{-# language TypeFamilies #-}
{-# language UndecidableInstances #-}

{-# options_ghc -Wno-orphans #-}


module Nix.Fresh where

import           Nix.Prelude
import           Control.Monad.Base   ( MonadBase(..) )
import           Control.Monad.Catch  ( MonadCatch
                                      , MonadMask
                                      , MonadThrow
                                      )
import           Control.Monad.Except ( MonadFix )
import           Control.Monad.Ref    ( MonadAtomicRef(..)
                                      , MonadRef(Ref)
                                      )

import           Nix.Thunk

newtype FreshIdT i m a = FreshIdT (ReaderT (Ref m i) m a)
  deriving
    ( a -> FreshIdT i m b -> FreshIdT i m a
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instance MonadTrans (FreshIdT i) where
  lift :: m a -> FreshIdT i m a
lift = ReaderT (Ref m i) m a -> FreshIdT i m a
forall i (m :: * -> *) a. ReaderT (Ref m i) m a -> FreshIdT i m a
FreshIdT (ReaderT (Ref m i) m a -> FreshIdT i m a)
-> (m a -> ReaderT (Ref m i) m a) -> m a -> FreshIdT i m a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. m a -> ReaderT (Ref m i) m a
forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift

instance MonadBase b m => MonadBase b (FreshIdT i m) where
  liftBase :: b α -> FreshIdT i m α
liftBase = ReaderT (Ref m i) m α -> FreshIdT i m α
forall i (m :: * -> *) a. ReaderT (Ref m i) m a -> FreshIdT i m a
FreshIdT (ReaderT (Ref m i) m α -> FreshIdT i m α)
-> (b α -> ReaderT (Ref m i) m α) -> b α -> FreshIdT i m α
forall b c a. (b -> c) -> (a -> b) -> a -> c
. b α -> ReaderT (Ref m i) m α
forall (b :: * -> *) (m :: * -> *) α. MonadBase b m => b α -> m α
liftBase

instance
  ( MonadAtomicRef m
  , Eq i
  , Ord i
  , Show i
  , Enum i
  , Typeable i
  )
  => MonadThunkId (FreshIdT i m)
 where
  type ThunkId (FreshIdT i m) = i
  freshId :: FreshIdT i m (ThunkId (FreshIdT i m))
freshId = ReaderT (Ref m i) m i -> FreshIdT i m i
forall i (m :: * -> *) a. ReaderT (Ref m i) m a -> FreshIdT i m a
FreshIdT (ReaderT (Ref m i) m i -> FreshIdT i m i)
-> ReaderT (Ref m i) m i -> FreshIdT i m i
forall a b. (a -> b) -> a -> b
$ do
    Ref m i
v <- ReaderT (Ref m i) m (Ref m i)
forall r (m :: * -> *). MonadReader r m => m r
ask
    Ref (ReaderT (Ref m i) m) i
-> (i -> (i, i)) -> ReaderT (Ref m i) m i
forall (m :: * -> *) a b.
MonadAtomicRef m =>
Ref m a -> (a -> (a, b)) -> m b
atomicModifyRef Ref m i
Ref (ReaderT (Ref m i) m) i
v (\i
i -> (i -> i
forall a. Enum a => a -> a
succ i
i, i
i))

runFreshIdT :: Functor m => FreshIdT i m a -> Ref m i -> m a
runFreshIdT :: FreshIdT i m a -> Ref m i -> m a
runFreshIdT = ReaderT (Ref m i) m a -> Ref m i -> m a
forall r (m :: * -> *) a. ReaderT r m a -> r -> m a
runReaderT (ReaderT (Ref m i) m a -> Ref m i -> m a)
-> (FreshIdT i m a -> ReaderT (Ref m i) m a)
-> FreshIdT i m a
-> Ref m i
-> m a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. FreshIdT i m a -> ReaderT (Ref m i) m a
coerce